The Greenland idea goes back (at least) to the 1st term, and there are some indications that it might trace back to, uhh, his handlers; Julia Davis, over on the Bad Place, had the receipts already back in 2022:
x.com/JuliaDavisNe...

fflat naurattaa enemmän kuin sen pitäisi 😅

Hei lopeta *taptap*

Any guesses as to who's behind it? Apparently #nottheonion 😅

This has to be high production value performance art.

It seems to me like a reasonable response to the personnel choices being made by the incoming administration. They're not exactly shy about wanting to relitigate old grievances. "When someone shows you who they are, believe them the first time."

The influenza B/Yamagata lineage is the one that's apparently disappeared as a result of the non-pharmacological interventions of the early Covid pandemic.
www.nature.com/articles/s41...